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DKG-117 User Manual
5. OTHER FEATURES
5.1 Synchronization Checking
The unit will check the synchronization only when both genset and busbar phase voltages are within
programmed limits and the synchronization is enabled either with the SYNCHRONIZATION CHECK ENABLE
signal or the SYNCH pushbutton.
If both busbar and genset phase voltages are within programmed limits, then the synchroscope will
illuminate. The synchroscope will show the phase angle between busbar and genset phase.
The synchronization checking consists of the verification of below conditions during 4 consecutive
busbar cycles:
-the busbar phase voltage should be between limits set by P_00 and P_01
-the genset phase voltage should be between limits set by P_02 and P_03
-the frequency difference between the busbar and genset should not exceed the limit set by P_04
-the voltage difference between the busbar and genset phases should not exceed the limit set by P_05
-the phase angle between the busbar and genset phase should not exceed the limit set by P_06
If both above conditions are satisfied for 4 consecutive busbar cycles then the CHECK SYNCH relay
will be immediately energized.
5.2 Dead Bus Enable
It may be required from a genset to close on an unpowered bus (dead bus). This is especially the case
for multi-genset synchronization systems, where one of the gensets must feed the busbar in order to serve
other gensets as a reference for synchronization.
When active, the DEAD BUS ENABLE input signal will force the SYNCH relay to close when both of
below conditions are met:
-synchronization checking enabled (either via input or pushbutton)
-the genset phase voltage is within limits set by P_02 and P_03,
-the busbar voltage is below the limit set by P_00.
Please note that, if the busbar voltage is above the set limit, the SYNCH CHECK relay output will not
close even if the DEAD BUS ENABLE signal is active. This feature is installed in order to prevent an eventual
non-synchronized closing of the paralleling contactor.
5.3 Pre-synchronization delay
Especially on engines without a body heater, it may be desired that the genset should not take the
load immediately after running.
The unit offers a timer controlled pre-synchronization delay feature. When the genset voltage is
within the limits, the engine will be allowed to run during parameter P_08, and then the synchronization
checking will be enabled. The default factory setting of this parameter is 3 seconds. If a delay is not
requested, the parameter may be set to 0.
WARNING: If the synchronization is lost after the CHECK
SYNCH relay is operated, the relay will not release.
It is the responsibility of the panel builder to use a quickly
closing contactor.
V-01
(24.03.2014)
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